According to the classification of sewage sources, sewage treatment is generally divided into production of sewage treatment and domestic sewage treatment. Production of sewage, including industrial wastewater, agricultural sewage and medical sewage, etc., and domestic sewage is the sewage generated by daily life, refers to the various forms of inorganic and organic complex mixtures, including: floating and floating size of solid particles; Like and gel-like diffuser; ③ pure solution.
According to the quality of water and sewage points, there are two types of water pollution: one is natural pollution; the other is man-made pollution, the current water hazards greater human pollution. Water pollution can be divided into different categories of chemical contaminants, physical pollution and biological contamination according to the different types of contaminants. The main pollutants are: (1) untreated industrial wastewater discharged; (2) untreated domestic sewage discharged; (3) extensive use of fertilizers, pesticides and herbicides in farmland wastewater; (4) industrial waste and household waste ; ⑸ soil erosion; ⑹ mine sewage.
There are many ways to deal with sewage, generally can be summarized as physical, chemical and biological methods.
Sewage Treatment Plant: Someone surveyed more than 100 large treatment plants, half the sun, as well as lack of funds \ high cost \ low efficiency, the general efficiency of less than 70%, low only 40%.
Sewage treatment costs Energy consumption situation: the basic are high energy consumption \ low efficiency.
With the development of science and technology, the direct utilization of sewage has become possible, and the use of sewage source heat pump system to make use of urban primary sewage.
The so-called primary sewage directly discharged untreated city life or industrial wastewater, the current stage of the use of primary sewage directly into the sewage heat pump system for heat exchange, in the case of consumption of small amounts of electricity for indoor cooling indoor building heating. Sewage reuse there are several technical difficulties to overcome: clogging, corrosion, heat transfer efficiency.
Sewage source heat pump system is a sewage heat exchanger and sewage source heat pump is composed of two parts. The city's original sewage directly into the sewage heat exchanger for heat transfer, in exchange for the heat from the sewage heat pump internal heat pump work done to the indoors.
On the city of primary sewage reuse, the advantages are: energy saving, pollution-free.